
NHTSA Interpretation File Search
Overview
NHTSA's Chief Counsel interprets the statutes that the agency administers and the standards and regulations that it issues. Members of the public may submit requests for interpretation, and the Chief Counsel will respond with a letter of interpretation. These interpretation letters look at the particular facts presented in the question and explain the agency’s opinion on how the law applies given those facts. These letters of interpretation are guidance documents. They do not have the force and effect of law and are not meant to bind the public in any way. They are intended only to provide information to the public regarding existing requirements under the law or agency policies.
Understanding NHTSA’s Online Interpretation Files
NHTSA makes its letters of interpretation available to the public on this webpage.
An interpretation letter represents the opinion of the Chief Counsel based on the facts of individual cases at the time the letter was written. While these letters may be helpful in determining how the agency might answer a question that another person has if that question is similar to a previously considered question, do not assume that a prior interpretation will necessarily apply to your situation.
- Your facts may be sufficiently different from those presented in prior interpretations, such that the agency's answer to you might be different from the answer in the prior interpretation letter;
- Your situation may be completely new to the agency and not addressed in an existing interpretation letter;
- The agency's safety standards or regulations may have changed since the prior interpretation letter was written so that the agency's prior interpretation no longer applies; or
- Some combination of the above, or other, factors.
Searching NHTSA’s Online Interpretation Files
Before beginning a search, it’s important to understand how this online search works. Below we provide some examples of searches you can run. In some cases, the search results may include words similar to what you searched because it utilizes a fuzzy search algorithm.
Single word search
Example: car
Result: Any document containing that word.
Multiple word search
Example: car seat requirements
Result: Any document containing any of these words.
Connector word search
Example: car AND seat AND requirements
Result: Any document containing all of these words.
Note: Search operators such as AND or OR must be in all capital letters.
Phrase in double quotes
Example: "headlamp function"
Result: Any document with that phrase.
Conjunctive search
Example: functionally AND minima
Result: Any document with both of those words.
Wildcard
Example: headl*
Result: Any document with a word beginning with those letters (e.g., headlamp, headlight, headlamps).
Example: no*compl*
Result: Any document beginning with the letters “no” followed by the letters “compl” (e.g., noncompliance, non-complying).
Not
Example: headlamp NOT crash
Result: Any document containing the word “headlamp” and not the word “crash.”
Complex searches
You can combine search operators to write more targeted searches.
Note: The database does not currently support phrase searches with wildcards (e.g., “make* inoperative”).
Example: Headl* AND (supplement* OR auxiliary OR impair*)
Result: Any document containing words that are variants of “headlamp” (headlamp, headlights, etc.) and also containing a variant of “supplement” (supplement, supplemental, etc.) or “impair” (impair, impairment, etc.) or the word “auxiliary.”
Search Tool
NHTSA's Interpretation Files Search
Interpretations | Date |
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ID: nht69-2.12OpenDATE: 01/28/69 FROM: AUTHOR UNAVAILABLE; William Haddon Jr. M.D.; NHTSA TO: House of Representatives TITLE: FMVSR INTERPRETATION TEXT: Thank you for your January 8 letter concerning comments by Mr. Jackson Decker of the E. D. Ptnyre Company, which was addressed to the National Highway Safety Bureau on December 20, 1968. I regret that Miss Claybrook of my staff was unable to locate Mr. Decker's letter after the call from your office requesting a copy of my response to Mr. Decker. Mr. Decker's letter consists of comments to the Federal Highway Administration Dockets on the pending proposed regulations under which information would be supplied by manufacturers to consumers about various safety performance characteristics of motor vehicles. My staff was unaware of this letter because it was addressed to the Docket and was sent by the mail room directly to the legal office which maintains all dockets. The dockets contain much of the source material which serves as the basis for final rule making on proposed standards and regulations. In addition, letters such as this are seldom answered not only because it is not appropriate to debate the substance of pending rulemaking actions, but also because the purpose of such correspondence is to provide information to the Government in the development of rulemaking. It is not treated as routine correspondence with the agency. In addition, the volume of such comments frequently reaches such vast proportions that it would be virtually impossible to answer them. For example, in response to a recent Federal Highway Administration proposed regulation some 4,000 comments were submitted. Mr. Decker, incidentally, does not indicate he expected a specific answer to his letter but, rather, in his last paragraph, asks that his views "be given serious consideration before proceeding with the issuance of part 275 of the Federal Motor Vehicle Safety Standards." On December 30, 1968, the Federal Highway Administrator issued a notice extending for 60 days the time for filing comments on a number of the proposed regulations for consumer information. This notice also specified that the proposed regulations would not apply to vehicles produced in two or more stages. I am enclosing a copy of this notice with the appropriate section marked for your information. I regret that we had to ask you to supply a copy of Mr. Decker's letter, but I trust that the above information resolves the issues he raised. |
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ID: nht69-2.13OpenDATE: 07/17/69 FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA TO: U.S. Suzuki Motor Corporation TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of July 8, 1969, in which you ask whether a form that you enclose satisfies the requirements of Consumer Information section S75.106, Acceleration and Pusint Ability. Your placement of the words "not capable" in the figure conforms to the requirements of the section. It is not necessary to include the words in the diagram also. In reference to your question concerning line spacing: In presenting the information "in essentially the form illustrated in Figure 1" (section 375.106(c)), it is not necessary that the manufacturer's presentation be an exact copy of the figure in respect to type face, line spacing, and so forth. The presentation in your enclosure would be adequate in those respects. In answer to your question about teduction of the figure. The regulation did not specify a type size, but the information is required to be exactly legible. The size in which the figure appeared in the Federal Register would appear to approximate the minimum in this regard. Finally, I should note that the "Description of Vehicles to which this Table Applies" is required by section 375.106(c)(1) to be "in the(Illegible Word) by which they are described to the public by the manufacturer". This would normally be in terms of the model designation,(Illegible Word) equipment, or other common description, not the regulatory type of "motor-driven(Illegible Word) as you indicate (unless, of course, this is your company(Illegible Word) designation of this type). I am pleased to be of assistance.
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ID: nht69-2.14OpenDATE: 07/18/69 FROM: AUTHOR UNAVAILABLE; Robert Brenner; NHTSA TO: Ward School Bus Manufacturing Incorporated TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of May 28, 1969, in which you request approval of an alternative to the label locations specified in Section 367.4(c) of the Certification Regulations that will be effective as to vehicles manufactured on or after September 1, 1969. The label location, on the panel ovay the driver's window, as shown in your enclosed photograph is acceptable. Your cooporation is appreciated. |
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ID: nht69-2.15OpenDATE: 12/16/69 FROM: AUTHOR UNAVAILABLE; C. A. Baker; NHTSA TO: Fiat Motor Company, Inc. TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of November 20, 1969, to Mr. Francis Armstrong, concerning your proposed windshield wiper system. We assume your new windshield wiping system will meet the requirements of S4.1.1.3 of Motor Vehicle Safety Standard No. 104, based upon your description of its operation. Note that S4.1.1.3 states "the highest and one lower frequency" -- the fact that you have even a lower frequency, to cycles per minute, does not conflict with this requirement. The main thing is you do offer a frequency differential of at least 15 cycles per minute measured from a low frequency of at least 20 cycles per minute. With respect to the requirements of Standard No. 104, I must point out that this Bureau does not issue approvals of windshield wiper systems or on vehicle designs incorporating this equipment. Therefore, the above comments are for your information only and in no way relieve the vehicle manufacturer from his responsibility for certifying that the assembled vehicle meets the requirements of the standard. |
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ID: nht69-2.16OpenDATE: 09/30/69 FROM: AUTHOR UNAVAILABLE; Robert Brenner; NHTSA TO: Honorable John A. Blatnik COPYEE: FHWA LEGAL 26-30; CONG. LIA.; MR. HITCKCOCK; OFF ACCIDENT AVOIDANCE, MVSPS TITLE: FMVSS INTERPRETATION TEXT: This is in further reply to your letter of September 9, 1969, in reference to the motor vehicle safety items discussed in Mr. Frank L. Van Alstine's letter of July 2, 1969, to Mr. H. M. Jacklin, Jr., Acting Director of our Motor Vehicle Safety Performance Service. I am enclosing a copy of our reply to Mr. Van Alstine's letter. As we indicated in our reply, Federal Motor Vehicle Safety Standard No. 107, "Reflecting Surfaces - Passenger Cars, Multipurpose Passenger Vehicles, Trucks and Buses," affects only original installation; it does not apply to replacement windshield wiper arms, such as those referred to in Mr. Van Alstine's letter. Federal Standard No. 210 specifies strength and general location requirements for lap and shoulder belt anchorages in passenger cars. Even though vehicles such as Mr. Van Alstine's 1969 Plymouth Valiant must meet this standard, some degree of discomfort may be experienced with certain(Illegible Word) positions and/or certain occupant sizes. As our reply stated, we are not aware of any significant injuries resulting from the present belt anchorage locations. Based on the information supplied by Mr. Van Alstine, it does not appear that the two situations described represent violations of Federal Motor Vehicle Safety Standards. It is most helpful to our efforts to improve highway safety when concerned citizens such as Mr. Van Alstine take the time to bring their safety experiences to our attention and that of their elected representatives. Enclosure |
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ID: nht69-2.17OpenDATE: 10/16/69 FROM: AUTHOR UNAVAILABLE; H. M. Jacklin, Jr.; NHTSA TO: E.T.R.T.O. TITLE: FMVSS INTERPRETATION TEXT: This will acknowledge your recent submittal of data to the National Highway Safety Bureau, concerning the addition of the belted-bias tire construction as a new category within Table I of Appendix A of Federal Motor Vehicle Safety Standard No. 109. Your submittal was not accompanies by a cover letter. The National Highway Safety Bureau realizes that this construction of motor vehicle passenger car tires warrants consideration within Standard No. 109. We do not believe, however, that the introduction of additional tables to the standard is needed to cover belted-bias tires. The tables within the standard are becoming voluminous and the variety of size designations are confusing to the consumer. During the recent ISO/TC 31 meetings in Rome, Mr. W. W. Jordan, Chief of the Tire Branch discussed briefly with members of your organization our philosophy on the standardization of the tire size designations and load inflation schedules. We have been working closely with the American Tire and Rim Association in further developing the alphanumerical system for tire size designations. We believe we are approaching a workable, standardized solution to the problem. In this light, we understand that members of E.T.R.T.O. visit the United States at regular intervals and we would like to extend an invitation to your organization to have a representative meet with us to review this matter and your petition in detail. The National Highway Safety Bureau, at the present time, does not plan to differentiate belted-bias type tire construction from other constructions, consequently, we will delay action on your petition until we have the opportunity to discuss it with your representative. |
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ID: nht69-2.18OpenDATE: 12/01/69 FROM: AUTHOR UNAVAILABLE; Robert Brenner; NHTSA TO: Executive Motors, Inc. TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of October 28, 1969, to the National Highway Safety Bureau, concerning our Federal Motor Vehicle safety standards. The Initial Federal Motor Vehicle Safety Standard No. 109, "New(Illegible Word) Tires - Passenger Cars" was published in the Federal Register on November 13, 1967. This standard specifies tire(Illegible Word) and laboratory test requirements for head unseating resistance, strength, endurance, and high speed performance; defines tire load ratings; and specifies labelling requirements. The standard also requested "Persons desiring an amendment to Standard No. 109 adding tires not presently listed, should submit sufficient pertinent information relative to these tires in 10 copies to the Secretary of Transportation---." The(Illegible Word) S.p.A. of Milan, Italy requested the addition of the 165-400 tire size designation to Standard No. 109 as well as the adoption of the letter symbols(Illegible Words) for tires. The(Illegible Words) petition was approved and published in the Federal Register on April 18, 1969. The(Illegible Word) tire size designation has been listed within Table I-D of Standard No. 109 since that time. The labelling requirements of Standard No. 109 apply to all new(Illegible Word) tires - both domestic and foreign - manufactured after January 1,(Illegible Word). There are no "special markings" required on the tires coming into this country other than those detailed in Standard No. 109. For your information, I have enclosed Federal Motor Vehicle Safety Standard No. 109 and No. 110 with amendments. The 165-400 tire size designation is currently listed within our Standard No. 109 and the labelling requirements are considered to be reasonable and in the interest of safety. The National Highway Safety Bureau does not prohibit any tire manufacturer from fabricating motor vehicle tires. The availability of tires from a specific tire manufacturer is a matter of that company's policy for marketing and has no direct relation to Federal Motor Vehicle Safety Standard No. 109. As required by the National Traffic and Motor Vehicle Safety Act of 1966, initial Federal Motor Vehicle Safety Standard No. 108, which deals with lighting requirements, was based on existing standards. Accordingly, the initial standard reflected existing requirements contained in Federal and State regulations and the Society of Automotive Engineers Standards on lighting equipment. Since publication of the initial standard on February 3, 1967, this Bureau has sponsored a continuing research program leading to the development of more effective and extensive requirements for vehicular lighting. In fact, during the past two years, eight research contracts have been awarded in the areas of improved forward and rear lighting systems. Under these contracts, in-depth studies, tests and evaluations will be conducted to determine the most effective color, size, intensity, location, and method of controlling the operation of the lamps which are required on the front and rear of motor vehicles. Further follow-on studies and evaluations are envisioned to determine the most-effectiveness and practicability of the proposed improved lighting systems. Results of this research will assist us in evaluating your suggestion and other similar suggestions relating to improved rear lighting systems. |
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ID: nht69-2.19OpenDATE: 12/02/69 FROM: AUTHOR UNAVAILABLE; R. H. Compton; NHTSA TO: Thompson Aircraft Tire Corporation TITLE: FMVSS INTERPRETATION TEXT: In response to your letter of November 6, 1969, the Department of Transporation hereby assigns number 211 to the Thompson Aircraft Tire Corporation, South San Francisco, California, as its approved code mark. The approved code mark is for use in identifying the tire manufacturer in accordance with S4.3 of the Federal Motor Vehicle Safety Standard No. 109 and the National Traffic and Motor Vehicle Act of 1966 (15 USC 1421(1)). You are cautioned that the approved code mark at the present time is for use only on new pneumatic passenger car tires. |
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ID: nht69-2.2OpenDATE: 05/02/69 FROM: AUTHOR UNAVAILABLE; Charles A. Baker; NHTSA TO: Reliance Trailer and Truck Company Inc. TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of March 12, 1969, to the Director of the National Highway Safety Bureau concerning your questions on mounting of clearance and identification lamps on your open top bulk commodity trailers. In response to your question no. 1, identification lamps mounted below the bottom edge of the tarp as shown on your attached marked print no. 2 appear to be in compliance with Standard No. 108. With the identification lamps to mounted the rear clearance lamps may be mounted at the extreme edge of the rear lower structure as shown on print no. 2. The answer to question numbers 2 and 3 is that the front clearance lamps should be mounted as high as practicable to clear the bottom edge of the tarp as shown on your attached marked print no. 2. With respect to the requirements of Standard No. 108, I must point out that this Bureau does not issue approvals on items of lighting equipment or on vehicle designs incorporating this equipment. Therefore, the above comments are for your information only and in no way relieve the vehicle manufacturer from his responsibility for certifying that the assembled vehicle meets the requirements of the standard. |
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ID: nht69-2.20OpenDATE: 11/24/69 FROM: R. H. COMPTON -- DIR., OFC. OF STANDARDS ON ACCIDENT AVOIDANCE, MVS PS, NHTSA; SIGNATURE BY C. A. BAKER TO: Gumifabriken Gislaved Aktiebolag TITLE: FMVSS INTERPRETATION TEXT: In response to your letter of November 3, 1969, the Department of Transportation hereby assigns number 210 to the Gumifabriken Gislaved Aktiebolag, Gislaved, Sweden, as its approved code mark. The approved code mark is for use in identifying the tire manufacturer in accordance with S4.3 of Federal Motor Vehicle Safety Standard No. 109 and the National Traffic and Motor Vehicle Safety Act of 1966 (15 USC 1421 (1)). Your attention is directed to the requirement for designation of an agent in accordance with the National Traffic and Motor Vehicle Safety Act of 1966, Subsection (110(e)). This requirement is implemented by our "General Procedural Rules, Subpart D - Service of Process; Agents. As requested, I have enclosed a copy of the Federal Motor Vehicle Safety Standards No. 109 and No. 110 with amendments. |
Request an Interpretation
You may email your request to Interpretations.NHTSA@dot.gov or send your request in hard copy to:
The Chief Counsel
National Highway Traffic Safety Administration, W41-326
U.S. Department of Transportation
1200 New Jersey Avenue SE
Washington, DC 20590
If you want to talk to someone at NHTSA about what a request for interpretation should include, call the Office of the Chief Counsel at 202-366-2992.
Please note that NHTSA’s response will be made available in this online database, and that the incoming interpretation request may also be made publicly available.